I've been doing a lot of studies lately. I start with figure sketches via Quickposes.com and put the timer on 60 seconds. After that I check them all again and rework things that didn't go right, find out what to look out for more. What's more important in the figure etc.
Then I do studies from one of my favourite movies, cloud atlas. In this I study a bunch of things. Mostly color harmony, values and composition. I'm also about to pick up on storyboarding some more too